Redmelove is right, I study jewelry design, because the diamond appraisal certificate generally only proves the grade of the diamond, and does not provide a fixed number of carats, because if once the jeweler provides the number of carats of the diamond, and you cut the original diamond in half, then you say that half is still the original number of carats? In order to avoid this speculation, the specific carat number of cut diamonds will not be provided in the general jewelry appraisal certificate, and only bare diamonds, that is, diamonds that have not been graded and cut and polished, have carat numbers. However, if you want to know the carat number of the gemstone you bought, you can ask the jeweler who bought the jewelry, and they will also provide you with the carat number of the diamond.